[opendtv] Re: Case for 720p60
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 22 Apr 2010 11:46:53 -0500
Craig Birkmaier wrote:
>> But let's get back to reality here. The 704 X 480 SD stream, in a
>> typical ATSC multicast, would be bit starved, as most SD subchannels
>> are.
>
> That is strictly a choice of the broadcaster. If this were the
> primary service it is not likely it would be bit starved, and might
> even look better than a bit starved 1080i encoding.
Old arguments, Craig. The fact is, broadcasters use HD for high quality, not
ED. If broadcasters use SD, it is either for the non-HD subchannels, leaving as
much room as possible for the HD stream, OR it's to pack as many SD channels as
possible in their 6 MHz channel.
So I'm saying, in reality, the SD subchannels WILL be bit starved. Hence, the
704 X 480 streams will hardly be used to extract the very best quality
possible.
> 480P will deliver BETTER image quality than 480i at the same bit
> rates.
Then you are claiming that Universal Sports could fit a 480p60 stream in a 2.5
Mb/s (avg) subchannel. Did anyone try this? What does it look like, compared to
480i?
Bert
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